User's Guide Part 2

Web-based management Chapter 6 Operation
phn-0896_009v003
6-14
UNDER DEVELOPMENT
Feb 2010
Receive Power
Receive power histogram is expressed in dBm and presented as: max, mean, min, and
latest. The max, min and latest are true instantaneous measurements; the mean is the
mean of a set of one second means. See Histogram data on
page 6-18.
Vector Error
The vector error measurement compares the received signal’s In phase / Quadrature
(IQ) modulation characteristics to an ideal signal to determine the composite error
vector magnitude. The results are stored in an histogram and expressed in dB and
presented as: max, mean, min and latest. The max, min and latest are true
instantaneous measurements; the mean is the mean of a set of one second means. The
expected range for Vector Error would be approximately -2dB (NLOS link operating at
sensitivity limit on BPSK 0.67) to –33dB (short LOS link running 256 QAM 0.83). See
Histogram data on
page 6-18.
Link Loss
The link loss is the total attenuation of the wireless signal between the two
point-to-point units. See Histogram data on
page 6-18.
The link loss calculation presented below:
Equation 6-1 Link loss
xxxx
RTRTll
ggPPP ++−=
Where is
ll
P
Link Loss (dB)
x
T
P
Transmit power of the remote wireless
unit (dBm)
x
R
P
Received signal power at the local unit
(dBm)
xx
RT
gg ,
Antenna gain at the remote and local
units respectively (dBi). The antenna
gain of the PTP 600 Series (23.5 dBi)
is used unless one or both of the units
is a Connectorized version.